Fisher&Paykel DW920 dishwasher

We bought a new Fisher&Paykel dishwasher today:). A F1 fault came up after we had a small blockage at the end of the drain hose:( - now cleared:). The problem is now the machine is bleeping and displaying the F1 fault :X- the water has drained away:?.

I had the same trouble, called a tech and he had to just tighten the screws holding the black wheels for the trays to slide in and out, this is in the inside of the dishwaher.
If lose it lets the water out and cause to flood.
Good luck